Numbers of the form n = r*s = (r+s)*t with gcd(r+s,t) = 1.

Terms

a(0) =4a(1) =18a(2) =48a(3) =100a(4) =150a(5) =180a(6) =294a(7) =448a(8) =490a(9) =588a(10) =648a(11) =900a(12) =960a(13) =1134a(14) =1210a(15) =1584a(16) =1620a(17) =2028a(18) =2100a(19) =2178a(20) =2548a(21) =2904a(22) =3150a(23) =3388a(24) =3630a(25) =3718a(26) =3840a(27) =4624a(28) =5040a(29) =5070